<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../react18/react.development.js"></script>
  <script src="../react18/react-dom.development.js"></script>
  <script src="../react18/babel.min.js"></script>
</head>

<body>
  <div id="app"></div>
  <script type="text/babel">

    class App extends React.Component{
      // 实例对象上的state
      state = {
        content : "啊啊啊"
      }

      render(){
        const {content} = this.state
        return (
          <div>
            <button onClick = {this.handle}>修改</button>
            <h1>我哈{content}</h1>
            <Son content = {content}/>
          </div>
        )
      }

      handle=()=>{
        const {content} = this.state
        this.setState({content:"哼哼哼"})
      }
    }

    class Son extends React.Component{
     
      render(){
        const {content} = this.props
        return <p>我咦{content}</p>
      }
    }
    


    const root = ReactDOM.createRoot(document.getElementById("app"))
    root.render(<App/>)
  </script>
</body>

</html>